Apparatus for pressure injecting casting material by diaphragm pumps



Sept. 9, 1952 H. MORIN APPARATUS FOR PRESSURE INJECTING CASTING MATERIALBY DIAPHRAGM PUMPS Filed May 12, 1949 INVENTOR.

LOUIS H. MORIN' ATTO E) Patented Sept. 9, 1952 I NITED; stares ears-Norrice APPARATUS FOR PRESSURE INJECTI NG CASTING; MATERIAL BY DIAPHRAGMPUMPS 7 Louis H; Morin, Bronx, N. Y.

Application May 12, 1949, Serial No. 92,752 v 1% Claims. (Cl. 22- 70) 1l invention relatesto die casting machines The member l4 forms acyclinder in which is wherein molten metal is forced, under iiressure,mounted a pistonn, havin 'araisee central porthrough a gopsenck into thecavities ofdies in tion 25 from which extends "a 'rod' 25;"the1a'tter Ii Yr ivior 'particularly', the inpassing throughthe head 260i thecylinder; The

veng n deals with casting machines of the char- 5 annular chamber '21isdesigned' to receive air acterd n d and c'apab ejoi use for the highunder pressure, from port 28;as later described. speed iormation of hasgs of: aluminum and Mounted onthe rod" 25 is a spring '2 tfth'e tenalurninumallovsl g 1 sion of which is adjusted by nuts 30, "Dependingl'henjovel features 0,1 the invention will be best from the head of'piston 23 is a forlged bearing understood from thejjollowingdescription when portionti'with which is pivotally coupledja link takentogether'with the accompanying drawing 32. Another link '33 is coupledwith the 1ink 3'2 in which certain embodiments of the invention and thelatter with a link 34 pivoted'to theupper are disclosed, and in whichthe separate parts are forked end 3;"; of the enlargeddis'c headf'ii'uof a designated by Suitable. reierence characters in plunger 31 each'ofthe views,andin which: 5 C p w t t l wer d p rti nf "the Fig. 1 is aschematic perspective view eta plunger rod 31' is aspaceror'coupling38which gooseneck diagrammatically illustrating the coup s .thdplunger 3".with h? pp disc par mounting and Operation of parts thereof, partof tion39 of a bellows-type pump Q01" The bellows t e 'construetionf' bei g iger; wai em t itt'eeepum at is iorrned from a" series or ring like tiqn.plates 4| having their-inner and outer edges Fig. 2 v is a verticalsectiorithrorigh the goosewelded togethenth'e'top disc being weldedtothe heels, tttd ctt e ttt F 1 and, h n th te t te plate 39, d he o o t'w te t e disiased in pa of a pot containing molten p1ug' i2; The plugQZ-h'asa drive fit in'a tapered metal; and I v socket 513 in the lowereiid of the goosenec1: bodi' Fig. 3 is a view similar to 2-, showingonly llj 'i 1 a part oi the construction andflshowing ariiodilThedisc 39also includes centrally thereof, a fication. rod extens'io'ri' ilwhichbasses downwardlyand In Fig. 1 (if the drawing, I have illustratedfreely through the b'eilows'du'and has arounded schematically; aperspective view' of a goose neck end '45 which operates in a bore 46iii the plug 42. t associated therewith tomount'and The plug 42 hasan'inlet port or ifia'ssage t! in firises a main 19W '.t bu1 ar body "II having an a ball check valve'lB is emnloyed which controls unwlardl yand outwardly directed discharge spout communication between the'port 4and bore 45. hef'u p g discharge end of which is The plug 42 has atransverse bore 49 which inmounteda diseha'rge n oazle [3; note Fig. :2.On terseqts the vertical bore 4Q=and which opens inthaunpe i end of thebody H is mounted an t to an annular groovefifl in the periphery of theinverte qnshtI @F ee ttee. tt h n m we e ite, h letter t eei t t th t tet sent (and it adapted to be clamped ubon the 119- of the gooseneckextension'or'arm 12. Also comper enjdof the dy l I, as by'means'of thebolt it. municating with the transverse bore 491s a'pair The r permitdft t ember' m has atone qr'verttc t rts 5 2 which open into theinterior side a pair i outwardly j extending arms'il 'of the bellows.The plate 39 has an air vent 53 itllmi l a pivotal mounting for thegooseneck to opening into the interior of the bellows, the'air gwtngfgin'ivot this indicated at iii, in Fig. i of ve e ng Controlled by ahall-valve 54 "seated in the drawing *ljhis: pivotal mounting isprovided the lower end of a rod The rod 55 hast, ttt tqvem nt of e. ozzit owar t5 te e tm' tt ie t 56 e' e a a the 'dies' in the operation ofinjecting adjustable screw 51 is emit-loved to" maintain "the castingmaterial into the cavity of the die. .Beball valve 54 in seated pq'sitiom 'ihus', theqpe'rtweenthe arms ll, the member l4 haste, boss It atinPiston 23 and theconnections to" and' inin which is mounted a screw 20,the lower flanged eluding bellows 49', and associated parts are all end2! of which engages a forked portion 22 on housed within thetubu1argooseneck body Lil.

the'upper end portion of the body II. The screw At 58 I haveishown amelting pot in 20 serves'to hold the parts or members H and Hi which thelower end "of the goosene ck ll} is ar in adjusted position with respectto each other ranged, suitable meg, is roviddfnpt hown, and thisadjusted position 'is defin tely fixed by theclamp bolt is. I

tte .tttettttett't t ete e aid 'gooseneck. The 'goos'enecl' comits lowerend which registers with the bore ifi'and aeoaevs which is indicated at59, at a desired temperature for injection into the cavity of the dies.It will also be noted that the level of the metal in the pot ismaintained at a point above the top of the disc 39 and preferably belowthe lower end of the plunger 31.

To withstand attack, as by molten aluminum, theworking and related partsof the pump, such as disc 39, bellows 40, rod 44 and plug 42, are madeof a suitably resistant material, it having been found that tungsten isparticularly desirable for this purpose. However, to avoid oxidation onexposure to atmosphere, its use is confined to those parts which arekept submerged; and the intermediate parts, such as spacer 38 and rod 55are desirably formed of ceramic material, which, at the same time, isable to withstand the high temperatures involved.

Returning now to Fig. 1 of the drawing, I have diagrammatically shown at60, a cam shaft having a cam 6| for actuating a rocker arm 62 mounted ina suitable bearing 53. At the other end of the bearing is an arm 64actuated by the rocker arm 62, the arm 64 supporting an'adjustable pin65 engaging one of the arms I! and by this means the gooseneck is swungon its pivots I8 to the slight extent necessary to move the nozzle [3into and out of engagement with the dies. On the shaft 60 is another cam66 for actuating an air valve 61 to control the admission of air underpressure, from inlet 10 and any suitable source of supply, to pipe 68and inlet 28. Valve 61 is channeled, as at 61', so that when the highpoint of cam 66 moves on and permits the valve to move to the left (asviewed in Fig. 1) to close off the air supply by way of'inlet 10, pipe68 will be vented by way of channel 61 and outlet 1 I.

In Fig. 3 of the drawing, I have shown a modified form of pump and insaid figure, I 2' represents part of a gooseneck spout similar to thegooseneck spout [2. In this instance the lower end of the tubular bodyof the gooseneck is closed by a plug 42', which has a short centervertical bore 13 communicating with a horizontal bore 14, the latteropening into an annular groove 15 in the periphery of the plug 42. Thegroove 15 registers with the port or passage of the gooseneck spout. Theplug 42' also has vertical passages 16 placing the horizontal bore 14 incommunication with a recess 11 formed in the upper end of the plug andserving as a pump chamber. Cooperating with chamber 11 is'a flexiblediaphragm or disc 18, The disc is fixedly supported on a flanged post 19having a rounded plunger end 80 which operates in the bore I3. At 31' isshown a plunger rod similar to the rod 31 and at 38' is shown a ceramiccoupling between the rod 31 and the post I9. As in the previouslydescribed construction, the parts 42', 18 and 19 are composed oftungsten or similar material. r p

In Fig. 3, I have shown a part of the molten metal pct 58', showing-therelationship of the gooseneck spout I2 therewith, as in Fig. 2 of thedrawing; It will be apparent from a consideration of Fig. 2, that'thecylinder ll of the gooseneck is open, as seen at 8!, at one sidethereof, a similar opening 8| being employed in Fig. 3. This openingallows free-admission of the molten metal into the gooseneck and alsorenders the parts in the cylinder of the gooseneck accessible,

as will be apparent. With the structure in Fig. 3, it will be apparentthat no air valve or bleeder, as at 53 and 54, is necessary and that inthe action of the diaphragm pump 18, the diaphragm raises sufiicientlyto admit molten metal into the chamber 71 in the various bores andpassages and up through the bore 5|, and this metal is pressure injectedinto the die in the downward movement of the diaphragm or in flexing thesame into the dotted line position shown in Fig. 3.

With the construction shown in Fig. l, the interior of bellows pump 40is completely filled with molten metal by relieving the pressure of rod55 on ball 54 and permitting any trapped air to escape. The ball 54 isthen clamped down tight to sealthe vent 53. Upon admitting air, underpressure, into the chamber 21, by actuation of the valve 61 by the cam66, the piston 23 is forced downwardly, which motion is transmitted tothe bellows unit 40 through the linkage and plunger rod described, anddownward movement of the bellows unit will operate to seat the valve 48and thus force the molten metal, under pressure, through the dischargenozzle [3 into the cavity of the dies. In other words, in each cycle ofoperation of the casting machine, a charge of the molten metal isintroduced, into the die cavity to form a casting. As will beunderstood, the nozzle 13 is moved toward the face of the die inreadiness for the injection of the charge and thereafter is withdrawnfrom contact with the die. While the movement is slight, the repeatedremoval of the nozzle from the die between injections minimizes thetransfer of heat from the nozzle to the die.

In the Fig. 3 construction, no preliminary venting of the pump chamberis necessary. Otherwise, the operation is substantially as abovedescribed.

In both forms, the injection pressure is ap-' plied positively'to themolten metal itself; that is, without any intervening air cushion at thepressure-receiving surface of the metal. And the compressed air used foractuating the pump is applied to a piston operating in a separatecylinder. which latter can be relieved or vented quickly withoutcreating any suction effect on the molten casting metal.

In the formation of aluminum die castings, and here reference toaluminum is to be' interpreted to mean aluminum or aluminum alloys,difficulty has been experienced between relatively movable parts due tothe formation of aluminum iron oxide on the parts. The formation of thisoxide produces what might be termed an abrasive, which would result inrelatively quickwear between the parts, or on the other hand, might alsoseize or freeze the parts against normal action.

To overcome these objectionable features, I employ a metal, such astungsten, which when operated in submersion in the molten aluminum,avoids the objectionable features above mentioned, or in other words, isnot susceptible to attack. From this standpoint and in a descriptivefashion, the expression of a material capable of withstanding the attackof molten aluminum will characterize materials of the kind underconsideration. With my present construction, no real close fitting ofparts is essential, but relatively movable parts are employed, and it isdesirable to maintain constant and free action or functioning of suchparts one with respect to the other.

Having fully described my invention, what I claim as new and desire tosecure by Letters Patentis:

1. In a gooseneck for die casting machines capable of casting aluminum,a pump unit mounted in the lower portion of the gooseneck ndsubmergeclinm lt i metal t b is harged from he ecoscnec c y; said. u it mova e mnsv ating the pump unit, said unit having a resilient,

deformable, sheet material memberas the effective pumping element forthe molten metal, said member being flexible in the direction ofmovement of said movable actuating means, said member being incontinuous contact with the molten metal and being resistant to theaction of moltenv aluminum, and said member being engageable andperiodically flexed by said movable actuating means to force moltenmetal through they gooseneclr;v to be discharged therefrom.

2. In a casting. machine capable of casting aluminum and wherein agcoseneck is employed mounted for swingin movement in a reservoir ofmolten metal, the lower portion of said gooseneck being immersed in andin communication with said reservoir, said goosenecl; having a disarcanecharge nozzle movable into and out of casting position and spaced fromand in communica= tion with the lower portion of the gooseneclc, the

improvement comprising a, sealing member; for

said lower portion of the gooseneck, a yieldable sheet material membersupported on the sealing member, means for actuating the yieldablemember including a post memberextending substantially centrally of theyieldable member and engageable with the sealing member, each of saidmembers being immersedin the molten metal and being resistant to theaction of molten aluminum, said sealing member having a passage- Wayconnecting the yieldable member with the nozzle so that said yieldablemember upon actuation by the actuating means may force molten metalthrough the passageway to the nozzle, said sealing member also havingmeans for receiving molten metal from said reservoir after eachactuation of the yieldable member, and said actuating means alsoincluding a ceramic coupling member for connecting the post member withthat portion of the actuating means not immersed in the molten metal.

3. In a casting machine capable of casting aluminum and wherein agooseneck is employed mounted in a reservoir of molten metal, the lowerportion of said goose-neck; being immersed in said molten metal, andsaid gooseneck having a discharge nozzle movable into and out of castingposition, the improvement comprising a sealing member in said lowerportion of the gooseneck, a flexible sheet material member supported onthe sealing member, means for actuating the flexible member, saidflexible member and sealing member being immersed in the molten metaland being resistant to the attack thereof, said sealing member having apassageway connecting the flexible member with the nozzle so that saidflexible member upon actuation by the actuating means may force moltenmetal through the passageway to the nozzle, and said actuating meansincluding a ceramic portion partly immersed in the molten metal.

4. In a casting machine employing a goosencck mounted in a reservoir ofmolten metal, the lower portion of said gooseneok being immersed in saidmolten metal, and said gooseneck having a discharge nozzle movable intoand out of casting position, the improvement comprising a sealing memberin said lower portion of the gooseneck, a flexible sheet material membersupported on the sealing member, means for actuating the flexible memberincluding a post member exten i g; t u h, the fifiti lanl ni sr and asble h seal ng member, each of aid l fimb di bfil d, mme sed; 1} 2 163 Qi n, et and b i g res t nt, to; h tt k the Sa d sealing member having apassageway connecting the flexiblemembec \viththe nozzleso that saidfiexiblemember upon actuation by the actuating means may forcemoltenmetal through thepassageway to thenozzle.

5.- n. a t st m chi e e p yi a gooseneck; mounted in a reservoir ofmolten metal, the lower portionot saidgoosenfik being immersed n moltenmeta said-" oose ck h vin a d r h rge zzle mo a e, nt n ou o tinposition, the improvement comprising a flexible resilient sheet materialmember supported in the lower portion of the gooseneck, means foractuating said i' lexiblev member to force'molten metal from thereservoir to said nozzle, said flexible member being submergediinthemolten metal and being resistant to the attack thereof, and said,actuating means including a ceramic coupling portion atten ing from apoint below to a point above thesurface of the molten metal.

6,. In. a tastin ma ne of the, cha a e scribed, the combination of agoosenecl; mounted a for swinging movement-in a reservoirof molten metalcomprising aluminum,. the lower portion ofv said g oosfeneck beingimmersed in and in communication with said molten metal, saidgooseneckhaving a discharge nozzle movable into and out offcasting position and"spaced. from and in communication with the lower portion oi thegocseneck, a flexible sheet material meme ber supported in said lowerportion of the gooseneck, means for actuating the flexible member toforce molten metal from the reservoir to said nozzle, saidflexiblemember and a portion or" said actuating means inengagementtherewith being immersed, in the molten metal and being formedof tungsten, and said actuating means including a ceramic couplingelement for connecting said portion of the actuating means with aportion of the actuating means not immersed in the molten metal.

7. A casting machine according to claim 6 in which the flexible memberis a diaphragm.

8. A casting machine according to claim Gin which the flexible member isa bellows.

9. In a casting machine of the character described for castingmetals ofrelatively high melting point such as aluminum, the combination of agooseneck the lower; end of which is adapted to be submerged in areservoir of molten metal, a discharge nozzle on the gooseneclz, acylinder adjustably coupled with the upper portion of the gooseneck, apiston in said cylinder, a pump unit the lower portion or the gooseneckand normally submerged in the molten metal, said pump uni h ng a flex lee ili n she t m t r me b as the efiec v um n l m n for pumping moltenmetal to said nozzle, a'plunger rod r ci g h p ton in o er ive n men w hsa d unit the P is. of sa d-u i bein r sistan t molten alumi um, an aeram coup ing lem n to c n e tin s id u it with s i ung r r d t a P intd cent he level of molten metal in said reservoir.

10. In a casting machine of the character described, the combination ofa gooseneck mounted for swinging movement in a reservoir of molten metalsuch as aluminum or aluminum alloys, the lower portion of said gooseneckbeing immersed in and in communication with said reservoir, saidgooseneck having a discharge nozzle movable into and out of castingposition, a tung-v aeoatvt sten sealing member in the lower portion ofthe gooseneck, a tungsten flexible, resilient member supported on thesealing member, said flexible member being deformable to enable it: tobe periodically flexed, means including a'tungsten post member foractuating the flexible member by periodically flexing the same,saidsealing, flexible, and post members being'immersed in the moltenmetal, said sealingmember'having a passageway connecting the flexiblemember with the nozzle so that said flexible member upon actuation bythe flexure means may force molten metal through the passageway to thenozzle, and said actuating means also including a ceramic couplingmember for connecting the post member with a portion of the actuatingmeans not immersed in themolten metal 11. In a casting machine of thecharacter described, the combination of a, gooseneck mounted forswinging movement in a reservoirof molten metal such as aluminum oraluminum alloys, the lower portion of said gocseneck being immersed inand in communication with said reservoir, said gooseneck having adischarge nozzle movable into and out ofcasting position, a sealingmember in the lower portion of the gooseneck, a flexible bellows membersupported on the sealing member, means including a post member foractuating the bellows member, said sealing, bellows, and post membersbeing immersed in the molten metal and being resistant to the actionthereof, said sealing member having a passageway connecting the bellowsmeniher with the nozzle so that said bellows member upon actuation bythe actuating means may force molten metal through the passageway to thenozzle, said sealing member having a second passageway connecting thebellows member with said reservoir, means in said sealing member forclosing and opening the second passageway during and after actuation ofthe bellows member, respectively, and said actuating means alsoineluding a ceramic coupling member for connecting the post member witha portion of the actuating means not immersed in the molten metal.

12. In a casting machine of the character described, the combination ofa gooseneck mounted for swinging movement in a reservoir of molten metalsuch as aluminum or aluminum alloys, the

lower portion of said gooseneck being immersed in and in communicationwith said reservoir, said gooseneck having a discharge nozzle movableinto and out of casting position, a sealing member in the lower portionof the gooseneck having a chamber in the upper portion thereof, aflexible diaphragm member supported on the sealing member, saiddiaphragm being disposed over and flexible into said chamber, meansincluding a post member for actuating the diaphragm member, saidsealing, diaphragm, and post members being immersed in the molten metaland being resistant to the action thereof, said sealing member having apassageway connecting the chamber with the nozzle so that said diaphragmmember upon actuation by the actuating means may force molten metalthrough the passageway to the nozzle, and said actuating 13. In acasting machine of the character described, the combination of agooseneck mounted for swinging movement in a reservoir of molten metal,the lower portion of said gooseneck being immersed in and incommunication with said reservoir, said gooseneclr having a dischargenozzle movable into and out of casting position, a sealing member in thelower portion of the gooseneck, a bellows member supported on thesealing member, said bellows member being provided with a closed upperend having a vent therein, means for actuating the bellows member, meansadjustably secured to said actuating means for closing said vent, saidsealing and bellows members being immersed in the molten metal and beingresistant to the action thereof, and said sealing member having apassageway connecting the bellows member with the nozzle so that saidbellows member upon actuation by the actuating means may force moltenmetal through the passageway to the nozzle.

14. In a casting machine of the character described for casting metalssuch as aluminum and aluminum alloys, the combination of a goose? neckthe lower end of which is adapted to be submerged in a reservoir ofmolten metal, a discharge nozzle on the gooseneck, a cylinder adjustablycoupled with the upper portion of the gooseneck, a piston in saidcylinder, a pump unit in the lower portion of the gooseneck and normallysubmerged in the molten metal, said pump unit including a flexible,resilient sheet material member actuatable to pump molten metal to thedischarge nozzle, said unit being resistant to molten aluminum, aplunger rod for placing the piston in operative engagement with saidunit, a plurality of movable links connecting said plunger rod with saidpiston, and a ceramic coupling element comiecting said unit with saidplunger rod at a point adjacent the level of molten metal in saidreservoir.

LOUIS H. MORIN.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATEN'IS Number Name Date 268,513 McKinley Dec, 5, 18821,580,479 Frankenfleld Apr. 13, 1926 1,964,324 Korsmo June 26, 19342,145,553 Morin Jan. 31, 1939 2,179,960 Schwarzkopf Nov. 14, 19392,195,360 Daesen Mar. 26, 1940 2,224,977 Morin Dec. 17, 1940 2,224,979Morin Dec. 17, 1940 2,273,896 Simms et al. Feb. 24, 1942 2,367,303 MorinJan. 16, 1945 FOREIGN PATENTS Number Country Date 588,780 Great BritainJune 3, 1947

